Write an inequality for this graph

Create a data set with 8 points in it that has a mean of approximately 10 and a standard deviation of approximately 1.

The owner of the plant nursery where you were tells you to fill 350 ml bottles from a 30 l from a fertilizer

You are standing next to a really big circular lake. you want to measure the diameter of the lake, but you don't want to have to swim across with a measuring tape! you decide to walk around the perimeter of the lake and measure its circumference, and find that it's 400\pi\text{ m}400? m. what is the diameter dd of the lake?